Aaron Mendelson

Data Reporter

Aaron Mendelson works on KPCC's data journalism and interactive projects.

At KPCC, he has used data to shine a light on the avalanche of outside money in local politics, spiking firearms sales, Los Angeles' bicycle infrastructure, and police militarization. He helped build a unique database on officer-involved shootings in Los Angeles County for KPCC's Officer Involved project.

Aaron joined KPCC in 2014 and became a member of the station's investigative team in 2017

He holds a master's degree from the UC Berkeley Graduate School of Journalism. Prior to joining KPCC, his work had been published and aired by Reuters, Marketplace, KQED and Mother Jones. He got his start in journalism at KFAI in Minneapolis.

An investigation by KPCC and The San Bernardino Sun found more than 70 percent of 103 people shot by officers in San Bernardino County in a six-year period disclosed or tested positive for substance use.

Explore are the trends in collisions in 55 of California's 58 counties — each county with a population of at least 10,000. While you can see broad similarities between many counties, each graph tells its own story.

As the economy has picked up since 2009, more trucks have been on the roads. That's meant more big truck collisions, which have an outsized cost, both financially and in terms of human life. Not only have their numbers jumped, but the share of all collisions that involve a big truck has been on the rise.

This user-friendly database shows vaccination exemption rates for incoming kindergartners at schools in Los Angeles, Orange, Riverside, San Bernardino and Ventura counties, based on data from the California Department of Public Health.

Metro's bike share network logged more than 130,000 trips in its first nine months. Using this map, you can explore the number of trips that started and ended at each of the network's Downtown Los Angeles stations.